diff --git a/test_package/CMakeLists.txt b/test_package/CMakeLists.txt
index 0230d2d7..fa7cc1a8 100644
--- a/test_package/CMakeLists.txt
+++ b/test_package/CMakeLists.txt
@@ -20,7 +20,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-cmake_minimum_required(VERSION 3.31)
+cmake_minimum_required(VERSION 3.30.5)
 project(test_package LANGUAGES CXX)
 
 message(STATUS "MP_UNITS_BUILD_CXX_MODULES: ${MP_UNITS_BUILD_CXX_MODULES}")